[Mapcss] Kothic JS - a full-featured JavaScript map rendering engine using HTML5 Canvas

[Peter Wendorff]

Am 30.06.2011 16:52, schrieb Ab_fab:
> Thanks for your swift reply Darafei,
> I also understand that SRTM data might need to be pre-processed prior 
> integration in the GeoJSON tiles.
> I just think that even after pre-processing, adjustments such as the 
> definition of the gap between two contour lines may still be possible 
> from the stylesheet (i.e. placing one thin line for every multiple of 
> 10 m elevation, bold line every multiple of 50 m ...)
That should be possible, I think:
Let's assume the SRTM is preprocessed to contain the contour-lines as 
vectors (linestrings).
Then each line has as an attribute it's elevation level.
With MapCSS you can set these lines as visible, e.g. printed as a thin 
black line - easy so far.

I'm not sure, but I think, it should be possible to check in some kind 
the elevation value with conditions in the selector, e.g.

way[contour_line][elevation%50=0]
{
   width:2;
}

way[contour_line][elevation%50=25]
{
   width:1;
}

Currently as far as I can see these more complex selectors are not 
implemented in Kothic, but I think, you are welcome to do that ;)

In general MapCSS should support these kind of of selectors, I think.

regards
Peter